package com.shangbang.verb.core.aspect;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;
import java.util.Enumeration;

/**
     * 日志切面
     */
    @Aspect
    @Component
    public class LogAspect {
        @Pointcut("execution(public * com.shangbang.verb.controller.*.*.*(..))")
        public void webLog(){}

        @Before("webLog()")
        public void deBefore(JoinPoint joinPoint) throws Throwable {
            // 接收到请求，记录请求内容
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
            // 记录下请求内容
            System.out.println("URL : " + request.getRequestURL().toString());
            System.out.println("HTTP_METHOD : " + request.getMethod());
            System.out.println("IP : " + request.getRemoteAddr());
            System.out.println("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
            //System.out.println("ARGS : " + Arrays.toString(joinPoint.getArgs()));
            System.out.println("-----获取参数开始----------");

            Enumeration enu=request.getParameterNames();
            while(enu.hasMoreElements()){
                String paraName=(String)enu.nextElement();
                System.out.println(paraName+": "+request.getParameter(paraName));
            }
            System.out.println("-----获取参数结束----------");
        }

        @AfterReturning(returning = "ret", pointcut = "webLog()")
        public void doAfterReturning(Object ret) throws Throwable {
            // 处理完请求，返回内容
            System.out.println("方法的返回值 : " + JSONObject.toJSONString(ret, SerializerFeature.WriteMapNullValue));
        }

        //后置异常通知
        @AfterThrowing("webLog()")
        public void throwss(JoinPoint jp){
            System.out.println("方法异常时执行.....");
        }

        //后置最终通知,final增强，不管是抛出异常或者正常退出都会执行
        @After("webLog()")
        public void after(JoinPoint jp){
            System.out.println("方法最后执行.....");
        }

        //环绕通知,环绕增强，相当于MethodInterceptor
        @Around("webLog()")
        public Object arround(ProceedingJoinPoint pjp) {
            System.out.println("方法环绕start.....");
            try {
                Object o =  pjp.proceed();
                System.out.println("方法环绕proceed，结果是 :" + o);
                return o;
            } catch (Throwable e) {
                e.printStackTrace();
                return null;
            }
        }
}
